After a violent incident with a special chemical, a research scientist is turned into a swamp plant monster.

"Swamp Thing" is a 1982 action comedy written and directed by Wes Craven. Starring Ray Wise, Louis Jourdan, Adrienne Barbeau and Dick Durock. After sabotage leads to Dr. Alec Holland being exposed to a chemical agent, he becomes the monstrous Swamp Thing...and sets out, along with Federal Agent and love interest Alice Cable, to bring justice to the man responsible for the accident...Dr. Anton Arcane. via Chas Blankenship

Synopsis:

Dr. Alec Holland, hidden away in the depths of a murky swamp, is trying to create a new species - a combination of animal and plant capable of adapting and thriving in the harshest conditions. Unfortunately he becomes subject of his own creation and is transformed . . . Arcane, desperate for the formula attempts to capture the Swamp Thing. An explosive chase ensues that ultimately ends with a confrontation between Holland and a changed Arcane . . .